Use Decimal Squares to model the four basic operations on decimals. Materials: C

Question

Use Decimal Squares to model the four basic operations on decimals. Materials: Copies of Bland k Decimal Squares form the website and Decimal Squares in the Manipulative Kit or Virtual Manipulative. The concept of addition of whole numbers, that is, putting together or combining amounts, is the same for addition of decimals. If the shaded amounts of Decimal Squares for .2 and .8 are combined, the total equals one whole square. Use your deck of Decimal Squares and answer parts a, b. and c. Write an addition equation for each pair of decimals. a. Find three pairs of Decimal Squares for tenths (red squares) for which the sum of the decimals in each pair is 1.0. Find three pairs of Decimal Squares for tenths (red squarest) for which the sum of the decimals in each pair is 1.0. Find three pairs of Decimal Squares for hundredths (green squares) for which the sum of the decimals in each pair is 1.0. Use decimals not equivalent to those used in part a. c. Find three pairs of Decimal Squares for thousandths (yellow squares) for which the sum of the decimals in each pair is 1.0. Use decimals not equivalent to those used in parts a and b.

Explanation / Answer

1. a) .1 + .9 = 1 ; 0.3+.7=1 ; 0.4+ 0.6 = 1;

2.b) 0.25+0.75=1; 0.48+0.52= 1; 0.36+0.64= 0.1;

3 c) 0.200+0.800=1 ; 0.364+0.636=1; 0.475 +0.525 = 1

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